Houston Texans quarterback Deshaun Watson (4) runs p-ast Tennessee Titans defensive end Jurrell Casey (99) for a 1-yard touchdown run during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans quarterback Deshaun Watson (4) runs p-ast Tennessee Titans defensive end Jurrell Casey (99) for a 1-yard touchdown run during the second quarter of an NFL football game at NRG Stadium on Sunday, ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans free safety Andre Hal (29) intercepts a pass intended for Tennessee Titans tight end Delanie Walker (82) during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans free safety Andre Hal (29) intercepts a pass intended for Tennessee Titans tight end Delanie Walker (82) during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) runs the ball for the first down during the first quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans quarterback Deshaun Watson (4) runs the ball for the first down during the first quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Houston Texans running back Lamar Miller (26) catches a pass from quarterback Deshaun Watson (4) on his way into the end zone for a touchdown during the first quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Houston Texans running back Lamar Miller (26) catches a pass from quarterback Deshaun Watson (4) on his way into the end zone for a touchdown during the first quarter of an NFL football game at NRG Stadium, ... more

Photo: Karen Warren, Houston Chronicle

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Houston Texans wide receiver DeAndre Hopkins (10) celebrates after catching a pass oduring the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans wide receiver DeAndre Hopkins (10) celebrates after catching a pass oduring the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Tennessee Titans running back DeMarco Murray (29) is stopped by Houston Texans outside linebacker Jadeveon Clowney (90) and free safety Andre Hal (29) during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Tennessee Titans running back DeMarco Murray (29) is stopped by Houston Texans outside linebacker Jadeveon Clowney (90) and free safety Andre Hal (29) during the first quarter of an NFL football game at NRG ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans running back Lamar Miller (26) runs past Tennessee Titans defensive end DaQuan Jones (90) and linebacker Jayon Brown (55) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans running back Lamar Miller (26) runs past Tennessee Titans defensive end DaQuan Jones (90) and linebacker Jayon Brown (55) during the second quarter of an NFL football game at NRG Stadium on ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) throws over Tennessee Titans defensive end Jurrell Casey (99) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans quarterback Deshaun Watson (4) throws over Tennessee Titans defensive end Jurrell Casey (99) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans wide receiver Will Fuller (15) catches the football for a touchdown in the end zone against Tennessee Titans cornerback LeShaun Sims (36) during the third quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Houston Texans wide receiver Will Fuller (15) catches the football for a touchdown in the end zone against Tennessee Titans cornerback LeShaun Sims (36) during the third quarter of an NFL football game at NRG ... more

Photo: Karen Warren, Houston Chronicle

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Houston Texans wide receiver Will Fuller (15) and tackle Chris Clark (74) celebrate Fuller's 16-yard touchdown reception against the Tennessee Titans during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans wide receiver Will Fuller (15) and tackle Chris Clark (74) celebrate Fuller's 16-yard touchdown reception against the Tennessee Titans during the second quarter of an NFL football game at NRG ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans linebacker Dylan Cole (51) jumps in front of Tennessee Titans tight end Delanie Walker (82) for an interception of a Matt Cassel pass, that he returned 25 yard for a touchdown, during the fourth quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. ( Brett Coomer / Houston Chronicle )

Houston Texans linebacker Dylan Cole (51) jumps in front of Tennessee Titans tight end Delanie Walker (82) for an interception of a Matt Cassel pass, that he returned 25 yard for a touchdown, during the fourth

Houston Texans linebacker Dylan Cole (51) tosses a football to 12-year-old Texans fan Haley Johnson, after he returned an interception of a pass by Tennessee Titans quarterback Matt Cassel 25 yard for a touchdown during the fourth quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans linebacker Dylan Cole (51) tosses a football to 12-year-old Texans fan Haley Johnson, after he returned an interception of a pass by Tennessee Titans quarterback Matt Cassel 25 yard for a ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans wide receiver Chris Thompson (14) is tackled by Tennessee Titans cornerback Brice McCain (23) and Tennessee Titans cornerback LeShaun Sims (36) on a long kick return during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans wide receiver Chris Thompson (14) is tackled by Tennessee Titans cornerback Brice McCain (23) and Tennessee Titans cornerback LeShaun Sims (36) on a long kick return during the second quarter of ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans linebacker Dylan Cole (51) celebrates his interception and touchdown with outside linebacker Jadeveon Clowney (90) during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Houston Texans linebacker Dylan Cole (51) celebrates his interception and touchdown with outside linebacker Jadeveon Clowney (90) during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. ... more

Photo: Karen Warren, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) celebrates after DeAndre Hopkins' touchdown during the first quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans quarterback Deshaun Watson (4) celebrates after DeAndre Hopkins' touchdown during the first quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Houston Texans head coach Bill O'Brien argues after a play during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans head coach Bill O'Brien argues after a play during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Houston Texans running back Lamar Miller (26) cuts outside against Tennessee Titans inside linebacker Avery Williamson (54) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans running back Lamar Miller (26) cuts outside against Tennessee Titans inside linebacker Avery Williamson (54) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans running back Lamar Miller (26) hands a fan his touchdown ball during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans running back Lamar Miller (26) hands a fan his touchdown ball during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) throws over Tennessee Titans defensive end Jurrell Casey (99) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans quarterback Deshaun Watson (4) throws over Tennessee Titans defensive end Jurrell Casey (99) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans wide receiver DeAndre Hopkins (10) beats Tennessee Titans cornerback Brice McCain (23) for an 8-yard touchdown reception during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans wide receiver DeAndre Hopkins (10) beats Tennessee Titans cornerback Brice McCain (23) for an 8-yard touchdown reception during the first quarter of an NFL football game at NRG Stadium on Sunday, ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans wide receiver DeAndre Hopkins (10) tosses a football to a fan after his 8-yard touchdown reception against the Tennessee Titans during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans wide receiver DeAndre Hopkins (10) tosses a football to a fan after his 8-yard touchdown reception against the Tennessee Titans during the first quarter of an NFL football game at NRG Stadium on ... more

Photo: Brett Coomer, Houston Chronicle

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Tennessee Titans tight end Delanie Walker (82) runs the ball against Houston Texans inside linebacker Zach Cunningham (41) during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Tennessee Titans tight end Delanie Walker (82) runs the ball against Houston Texans inside linebacker Zach Cunningham (41) during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, ... more

Photo: Karen Warren, Houston Chronicle

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Houston Texans wide receiver DeAndre Hopkins (10) catches a pass over Tennessee Titans cornerback Brice McCain (23) during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Houston Texans wide receiver DeAndre Hopkins (10) catches a pass over Tennessee Titans cornerback Brice McCain (23) during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in ... more

Photo: Karen Warren, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) scrambles for a few yards against Tennessee Titans defensive end Jurrell Casey (99) during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Houston Texans quarterback Deshaun Watson (4) scrambles for a few yards against Tennessee Titans defensive end Jurrell Casey (99) during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. ... more

Photo: Karen Warren, Houston Chronicle

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Tennessee Titans quarterback Marcus Mariota (8) walks off the field after suffering a hamstring injury during the third quarter of an NFL football game against the Houston Texans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Tennessee Titans quarterback Marcus Mariota (8) walks off the field after suffering a hamstring injury during the third quarter of an NFL football game against the Houston Texans at NRG Stadium on Sunday, Oct. ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) passes against the Tennessee Titans during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans quarterback Deshaun Watson (4) passes against the Tennessee Titans during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans linebacker Dylan Cole (51) tackles Tennessee Titans quarterback Marcus Mariota (8) during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans linebacker Dylan Cole (51) tackles Tennessee Titans quarterback Marcus Mariota (8) during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans running back D'Onta Foreman (27) breaks out of the pack during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans running back D'Onta Foreman (27) breaks out of the pack during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Tennessee Titans running back Derrick Henry (22) tries to gain yardage against Houston Texans outside linebacker Jadeveon Clowney (90) during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Tennessee Titans running back Derrick Henry (22) tries to gain yardage against Houston Texans outside linebacker Jadeveon Clowney (90) during the fourth quarter of an NFL football game at NRG Stadium, Sunday, ... more

Photo: Karen Warren, Houston Chronicle

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Tennessee Titans quarterback Matt Cassel (16) gets the pass off before getting hit by Houston Texans defensive end J.J. Watt (99) during the third quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Tennessee Titans quarterback Matt Cassel (16) gets the pass off before getting hit by Houston Texans defensive end J.J. Watt (99) during the third quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, ... more

Photo: Karen Warren, Houston Chronicle

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Tennessee Titans cornerback Adoree' Jackson (25) runs the ball against Houston Texans wide receiver Chris Thompson (14) during the third quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston. less

Tennessee Titans cornerback Adoree' Jackson (25) runs the ball against Houston Texans wide receiver Chris Thompson (14) during the third quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in ... more

Photo: Karen Warren, Houston Chronicle

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Houston Texans running back D'Onta Foreman (27) is tripped up by Tennessee Titans cornerback Logan Ryan (26) during the fourth quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans running back D'Onta Foreman (27) is tripped up by Tennessee Titans cornerback Logan Ryan (26) during the fourth quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) runs the ball during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans quarterback Deshaun Watson (4) runs the ball during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Tennessee Titans free safety Kevin Byard (31) breaks up a pass intended for Houston Texans wide receiver DeAndre Hopkins (10) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Tennessee Titans free safety Kevin Byard (31) breaks up a pass intended for Houston Texans wide receiver DeAndre Hopkins (10) during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) passes the ball during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans quarterback Deshaun Watson (4) passes the ball during the second quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Houston Texans running back Lamar Miller (26) races downfield for a first down reception against the Tennessee Titans during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans running back Lamar Miller (26) races downfield for a first down reception against the Tennessee Titans during the first quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans quarterback Deshaun Watson (4) breaks away from Tennessee Titans defensive end Jurrell Casey (99) for a 1-yard touchdown run during the second quarter of an NFL football game at NRG Stadium on Sunday, Oct. 1, 2017, in Houston. less

Houston Texans quarterback Deshaun Watson (4) breaks away from Tennessee Titans defensive end Jurrell Casey (99) for a 1-yard touchdown run during the second quarter of an NFL football game at NRG Stadium on ... more

Photo: Brett Coomer, Houston Chronicle

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Houston Texans quarterback Deshaun Watson waves to fans as he celebrates the Texans 57-14 win over the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans quarterback Deshaun Watson waves to fans as he celebrates the Texans 57-14 win over the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans players lock arms as they stand for the National Anthem before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans players lock arms as they stand for the National Anthem before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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The Tennessee Titans standing for the National Anthem before the start of the first quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

The Tennessee Titans standing for the National Anthem before the start of the first quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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A Houston Texans fan with a sign during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

A Houston Texans fan with a sign during the fourth quarter of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Houston Texans defensive end Christian Covington greets fans on the field before the start of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans defensive end Christian Covington greets fans on the field before the start of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Houston Texans defensive end Christian Covington kisses his mother Natalie Covington before the start of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Houston Texans defensive end Christian Covington kisses his mother Natalie Covington before the start of an NFL football game at NRG Stadium, Sunday, Oct. 1, 2017, in Houston.

Photo: Karen Warren, Houston Chronicle

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Houston Texans fans walk around outside the stadium while tailgating before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans fans walk around outside the stadium while tailgating before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans fans pose for photos outside the stadium before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans fans pose for photos outside the stadium before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans fan Anita Rodriguez tailgates before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans fan Anita Rodriguez tailgates before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans fans Rey Perez, left, and Armando Garcia wak through the parking lot before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans fans Rey Perez, left, and Armando Garcia wak through the parking lot before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Houston Texans fan Rob Gonzalez is seen between a pair of flags while tailgating before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Houston Texans fan Rob Gonzalez is seen between a pair of flags while tailgating before an NFL football game against the Tennessee Titans at NRG Stadium on Sunday, Oct. 1, 2017, in Houston.

Photo: Brett Coomer, Houston Chronicle

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Texans' Jeff Allen primed to square off against old team

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When Texans offensive guard Jeff Allen faced his old team a year ago for the first time, it was an emotional experience.

The Kansas City Chiefs were the team that drafted him in the second round and he'd been a starter for them before signing a four-year, $28 million free agent deal with the Texans.

Now, it's more of a normal football game for Allen as he prepares to face the undefeated Chiefs on Sunday night at NRG Stadium.

"It's a year removed now, so, if this wasn't home before, it's home now," Allen said. "Obviously, I still know a lot of guys there. I've got a lot of respect for them.

"They're playing really well as a team. They're playing good football. It's going to be a challenge for us."

The Chiefs' defense is led by outside linebacker Justin Houston, who already has four sacks.

"They're probably one of the better front sevens we'll face all year," Allen said. "It's hard to find a weakness. They're pretty solid across the board. We've got to come out and play physical."

The Texans have allowed 17 sacks this season, but 10 of those were yielded in the season-opening loss to the Jacksonville Jaguars. The line has improved in recent weeks.

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"Individually, we're all finding that confidence and being physical as a group," Allen said. "Confidence is huge. Having confidence in that guy next to you, which we do, having that trust is huge. It's growing for all of us."